﻿//-----------------------------------------------------------------------
// <copyright file="HtmlHelperStyleSheetsExtensions.cs" company="OOHM PROCESSAMENTO DE DADOS LTDA.">
//     Microsoft Public License (MS-PL) This license governs use of the accompanying
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//-----------------------------------------------------------------------
namespace AbstractSaaSTemplate.Web.UI.Helpers{    using System;
    using System.Web;
    using System.Web.Mvc;
    using AbstractSaaSTemplate.Application.Customization;

    /// <summary>
    /// Provides methods that respond to HTTP requests that are made to an ASP.NET
    /// MVC Web site, customised for this application.
    /// </summary>
    public static class HtmlHelperStyleSheetsExtensions
    {
        /// <summary>
        /// Renders an inclusion to a stylesheet file, casting it from the right
        /// stylesheets repository
        /// </summary>
        /// <param name="helper">The helper which will be extended</param>
        /// <param name="fileName">The filename which will be extended</param>
        /// <returns>Returns an instance of MvcHtmlString containing the tag</returns>
        public static MvcHtmlString StyleSheet(
            this HtmlHelper helper,
            string fileName)
        {
            if (helper == null)
            {
                throw new ArgumentNullException("helper");
            }

            if (string.IsNullOrWhiteSpace(fileName))
            {
                throw new ArgumentNullException("fileName");
            }
            
            // Create the tag
            var tag = new TagBuilder("link");

            // Checks and Treats the location
            const string VirtualPathIndicator = "~";
            const string FileExtension = ".css";

            if (fileName.EndsWith(FileExtension, StringComparison.OrdinalIgnoreCase))
            {
                fileName = fileName.Replace(
                    FileExtension,
                    string.Empty);
            }

            // there may be a custom theme defined
            var themeName = helper.GetThemeFromActiveTenant().ToString();

            // there may be an indication of virtual path
            // if that is the case, it means that only the
            // filename was indicated and that therefore
            // we have to build the path to the file
            if (!fileName.Contains(VirtualPathIndicator))
            {
                fileName = string.Concat(
                    "~/Content/Themes/",
                    themeName,
                    "/",
                    fileName,
                    FileExtension);
            }
            
            fileName = VirtualPathUtility.ToAbsolute(fileName);

            // Add attributes
            tag.MergeAttribute("type", "text/css");
            tag.MergeAttribute("rel", "stylesheet");
            tag.MergeAttribute("href", fileName);

            // Render tag
            var html = tag.ToString(TagRenderMode.SelfClosing);
            return MvcHtmlString.Create(html);
        }
    }
}


